fb0b154c80
Report the configured granularity for discard operation to the guest. If this is not set use the block size. Since until now we have ignored the configured discard granularity and always reported the block size, let's add 'report-discard-granularity' property and disable it for older machine types to avoid migration issues. Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <20210225001239.47046-1-akihiko.odaki@gmail.com>
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/*
|
|
* Virtio Block Device
|
|
*
|
|
* Copyright IBM, Corp. 2007
|
|
*
|
|
* Authors:
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#ifndef QEMU_VIRTIO_BLK_H
|
|
#define QEMU_VIRTIO_BLK_H
|
|
|
|
#include "standard-headers/linux/virtio_blk.h"
|
|
#include "hw/virtio/virtio.h"
|
|
#include "hw/block/block.h"
|
|
#include "sysemu/iothread.h"
|
|
#include "sysemu/block-backend.h"
|
|
#include "qom/object.h"
|
|
|
|
#define TYPE_VIRTIO_BLK "virtio-blk-device"
|
|
OBJECT_DECLARE_SIMPLE_TYPE(VirtIOBlock, VIRTIO_BLK)
|
|
|
|
/* This is the last element of the write scatter-gather list */
|
|
struct virtio_blk_inhdr
|
|
{
|
|
unsigned char status;
|
|
};
|
|
|
|
#define VIRTIO_BLK_AUTO_NUM_QUEUES UINT16_MAX
|
|
|
|
struct VirtIOBlkConf
|
|
{
|
|
BlockConf conf;
|
|
IOThread *iothread;
|
|
char *serial;
|
|
uint32_t request_merging;
|
|
uint16_t num_queues;
|
|
uint16_t queue_size;
|
|
bool seg_max_adjust;
|
|
bool report_discard_granularity;
|
|
uint32_t max_discard_sectors;
|
|
uint32_t max_write_zeroes_sectors;
|
|
bool x_enable_wce_if_config_wce;
|
|
};
|
|
|
|
struct VirtIOBlockDataPlane;
|
|
|
|
struct VirtIOBlockReq;
|
|
struct VirtIOBlock {
|
|
VirtIODevice parent_obj;
|
|
BlockBackend *blk;
|
|
void *rq;
|
|
QEMUBH *bh;
|
|
VirtIOBlkConf conf;
|
|
unsigned short sector_mask;
|
|
bool original_wce;
|
|
VMChangeStateEntry *change;
|
|
bool dataplane_disabled;
|
|
bool dataplane_started;
|
|
struct VirtIOBlockDataPlane *dataplane;
|
|
uint64_t host_features;
|
|
size_t config_size;
|
|
};
|
|
|
|
typedef struct VirtIOBlockReq {
|
|
VirtQueueElement elem;
|
|
int64_t sector_num;
|
|
VirtIOBlock *dev;
|
|
VirtQueue *vq;
|
|
IOVDiscardUndo inhdr_undo;
|
|
IOVDiscardUndo outhdr_undo;
|
|
struct virtio_blk_inhdr *in;
|
|
struct virtio_blk_outhdr out;
|
|
QEMUIOVector qiov;
|
|
size_t in_len;
|
|
struct VirtIOBlockReq *next;
|
|
struct VirtIOBlockReq *mr_next;
|
|
BlockAcctCookie acct;
|
|
} VirtIOBlockReq;
|
|
|
|
#define VIRTIO_BLK_MAX_MERGE_REQS 32
|
|
|
|
typedef struct MultiReqBuffer {
|
|
VirtIOBlockReq *reqs[VIRTIO_BLK_MAX_MERGE_REQS];
|
|
unsigned int num_reqs;
|
|
bool is_write;
|
|
} MultiReqBuffer;
|
|
|
|
bool virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq);
|
|
void virtio_blk_process_queued_requests(VirtIOBlock *s, bool is_bh);
|
|
|
|
#endif
|